const obj={
    name:'唐扬',
    age:18,
    like:['篮球','足球'],
    a:undefined,
    b:null,
    c:function(){},
    e:Symbol(1),
    f:{
       n:obj.f
    }
}
const newObj=JSON.parse(JSON.stringify(obj))
obj.like.push('跑步 ')
console.log(newObj);
